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                    <h1 class="description center-align post-title">制作一个获取网易云音乐下载链接的服务器</h1>
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                <h4 id="技术栈"><a href="#技术栈" class="headerlink" title="技术栈"></a>技术栈</h4><ul>
<li>Koa基础</li>
</ul>
<p>推荐一篇<a target="_blank" rel="noopener" href="http://www.ruanyifeng.com/blog/2017/08/koa.html?bsh_bid=1983230339">博客</a>，把koa讲的非常易懂，几乎看懂他提供的例子后koa就会得差不多了，如果有时间，我可能也会写一篇教程。</p>
<ul>
<li>JavaScript基础</li>
<li>HTML基础</li>
</ul>
<h4 id="用到的Node-js模块"><a href="#用到的Node-js模块" class="headerlink" title="用到的Node.js模块"></a>用到的Node.js模块</h4><ul>
<li>koa</li>
<li>koa-route</li>
<li>axios</li>
<li>crypto-js</li>
</ul>
<p>如果你用的WebStorm，直接写</p>
<pre><code class="javascript">const Koa = require(&quot;koa&quot;)
const querystring = require(&quot;querystring&quot;)
const CryptoJS = require(&quot;crypto-js&quot;)
const axios = require(&#39;axios&#39;)
const fs = require(&quot;fs&quot;);
const route = require(&#39;koa-route&#39;);
const app = new Koa();</code></pre>
<p>即可，WebStorm会自动提示你安装。</p>
<p>其实自己安装也很简单，先切换到工作目录，用cmd或shell运行：</p>
<pre><code class="shell">npm install koa
npm install koa-route
npm install axios
npm isntall crypto-js</code></pre>
<h1 id="实现"><a href="#实现" class="headerlink" title="实现"></a>实现</h1><h2 id="1-抓包、定位加密代码"><a href="#1-抓包、定位加密代码" class="headerlink" title="1. 抓包、定位加密代码"></a>1. 抓包、定位加密代码</h2><p>首先打开网易云音乐网页版，进入任意一首歌，打开浏览器的DevTools，选择Network，点击播放，稍加分析，不难看出，这个<code>post</code>请求是用来获取音乐链接。</p>
<p><img src="%E6%8A%93%E5%8C%85.png" alt="抓包"></p>
<p>切换到调用栈(Initiator)，看看发送它的函数在哪</p>
<p><img src="%E8%B0%83%E7%94%A8%E6%A0%88.png" alt="调用栈"></p>
<p>打开，发现是一大坨看不懂的代码</p>
<p><img src="%E4%B8%80%E5%A4%A7%E5%9D%A8%E4%B8%8D%E6%83%B3%E7%9C%8B%E7%9A%84%E4%BB%A3%E7%A0%81.png" alt="一大坨不想看的代码"></p>
<p>看来这样走不通，那就搜搜post请求的data吧，<code>Ctrl</code>+<code>F</code>，搜<code>encSecKey</code></p>
<p><img src="%E8%AF%B7%E6%B1%82%E5%A4%B4.png" alt="请求头"></p>
<p><img src="%E5%AE%9A%E4%BD%8D%E5%8A%A0%E5%AF%86%E4%BB%A3%E7%A0%81.png" alt="定位加密代码"></p>
<p>嗯，完美，很显然，这里的两个参数来自第13297行(可能你看到的行数和我不一样)的<code>window.asrsea()</code>函数</p>
<p>先刷新一下，再在那一行打个断点，点击播放</p>
<p>断点触发，进入<code>window.asrsea()</code>函数</p>
<p><img src="%E8%BF%9B%E5%85%A5%E5%8A%A0%E5%AF%86%E5%87%BD%E6%95%B0.png" alt="进入加密函数"></p>
<p>再在那个<code>d(d,e,f,g)</code>函数的第一行打个断点，可以看到这就是我们要找的加密函数。</p>
<h2 id="2-分析加密代码"><a href="#2-分析加密代码" class="headerlink" title="2. 分析加密代码"></a>2. 分析加密代码</h2><p><img src="%E5%8A%A0%E5%AF%86%E4%BB%A3%E7%A0%81.png" alt="加密代码"></p>
<p>在左边的局部变量中看出，<code>d</code>保存的是一个字符串化的json，保存着要获取的歌曲id</p>
<pre><code class="json">&#123;
    id: [
        32102297
    ],
    level: &quot;standard&quot;,
    encodeType: &quot;aac&quot;,
    csrf_token: &quot;&quot;
&#125;</code></pre>
<p>经过多次测试，<code>e</code>是一个定值：<code>&quot;010001&quot;</code>，来自<code>[&quot;流泪&quot;, &quot;强&quot;]</code>两个表情转换为对应的代码，转换映射如下：</p>
<pre><code class="json">&#123;
    &quot;色&quot;: &quot;00e0b&quot;,
    &quot;流感&quot;: &quot;509f6&quot;,
    &quot;这边&quot;: &quot;259df&quot;,
    &quot;弱&quot;: &quot;8642d&quot;,
    &quot;嘴唇&quot;: &quot;bc356&quot;,
    &quot;亲&quot;: &quot;62901&quot;,
    &quot;开心&quot;: &quot;477df&quot;,
    &quot;呲牙&quot;: &quot;22677&quot;,
    &quot;憨笑&quot;: &quot;ec152&quot;,
    &quot;猫&quot;: &quot;b5ff6&quot;,
    &quot;皱眉&quot;: &quot;8ace6&quot;,
    &quot;幽灵&quot;: &quot;15bb7&quot;,
    &quot;蛋糕&quot;: &quot;b7251&quot;,
    &quot;发怒&quot;: &quot;52b3a&quot;,
    &quot;大哭&quot;: &quot;b17a8&quot;,
    &quot;兔子&quot;: &quot;76aea&quot;,
    &quot;星星&quot;: &quot;8a5aa&quot;,
    &quot;钟情&quot;: &quot;76d2e&quot;,
    &quot;牵手&quot;: &quot;41762&quot;,
    &quot;公鸡&quot;: &quot;9ec4e&quot;,
    &quot;爱意&quot;: &quot;e341f&quot;,
    &quot;禁止&quot;: &quot;56135&quot;,
    &quot;狗&quot;: &quot;fccf6&quot;,
    &quot;亲亲&quot;: &quot;95280&quot;,
    &quot;叉&quot;: &quot;104e0&quot;,
    &quot;礼物&quot;: &quot;312ec&quot;,
    &quot;晕&quot;: &quot;bda92&quot;,
    &quot;呆&quot;: &quot;557c9&quot;,
    &quot;生病&quot;: &quot;38701&quot;,
    &quot;钻石&quot;: &quot;14af6&quot;,
    &quot;拜&quot;: &quot;c9d05&quot;,
    &quot;怒&quot;: &quot;c4f7f&quot;,
    &quot;示爱&quot;: &quot;0c368&quot;,
    &quot;汗&quot;: &quot;5b7a4&quot;,
    &quot;小鸡&quot;: &quot;6bee2&quot;,
    &quot;痛苦&quot;: &quot;55932&quot;,
    &quot;撇嘴&quot;: &quot;575cc&quot;,
    &quot;惶恐&quot;: &quot;e10b4&quot;,
    &quot;口罩&quot;: &quot;24d81&quot;,
    &quot;吐舌&quot;: &quot;3cfe4&quot;,
    &quot;心碎&quot;: &quot;875d3&quot;,
    &quot;生气&quot;: &quot;e8204&quot;,
    &quot;可爱&quot;: &quot;7b97d&quot;,
    &quot;鬼脸&quot;: &quot;def52&quot;,
    &quot;跳舞&quot;: &quot;741d5&quot;,
    &quot;男孩&quot;: &quot;46b8e&quot;,
    &quot;奸笑&quot;: &quot;289dc&quot;,
    &quot;猪&quot;: &quot;6935b&quot;,
    &quot;圈&quot;: &quot;3ece0&quot;,
    &quot;便便&quot;: &quot;462db&quot;,
    &quot;外星&quot;: &quot;0a22b&quot;,
    &quot;圣诞&quot;: &quot;8e7&quot;,
    &quot;流泪&quot;: &quot;01000&quot;,
    &quot;强&quot;: &quot;1&quot;,
    &quot;爱心&quot;: &quot;0CoJU&quot;,
    &quot;女孩&quot;: &quot;m6Qyw&quot;,
    &quot;惊恐&quot;: &quot;8W8ju&quot;,
    &quot;大笑&quot;: &quot;d&quot;
&#125;</code></pre>
<p><code>f</code>同样是定值，来自一下表情转换为代码</p>
<pre><code class="json">[&quot;色&quot;, &quot;流感&quot;, &quot;这边&quot;, &quot;弱&quot;, &quot;嘴唇&quot;, &quot;亲&quot;, &quot;开心&quot;, &quot;呲牙&quot;, &quot;憨笑&quot;, &quot;猫&quot;, &quot;皱眉&quot;, &quot;幽灵&quot;, &quot;蛋糕&quot;, &quot;发怒&quot;, &quot;大哭&quot;, &quot;兔子&quot;, &quot;星星&quot;, &quot;钟情&quot;, &quot;牵手&quot;, &quot;公鸡&quot;, &quot;爱意&quot;, &quot;禁止&quot;, &quot;狗&quot;, &quot;亲亲&quot;, &quot;叉&quot;, &quot;礼物&quot;, &quot;晕&quot;, &quot;呆&quot;, &quot;生病&quot;, &quot;钻石&quot;, &quot;拜&quot;, &quot;怒&quot;, &quot;示爱&quot;, &quot;汗&quot;, &quot;小鸡&quot;, &quot;痛苦&quot;, &quot;撇嘴&quot;, &quot;惶恐&quot;, &quot;口罩&quot;, &quot;吐舌&quot;, &quot;心碎&quot;, &quot;生气&quot;, &quot;可爱&quot;, &quot;鬼脸&quot;, &quot;跳舞&quot;, &quot;男孩&quot;, &quot;奸笑&quot;, &quot;猪&quot;, &quot;圈&quot;, &quot;便便&quot;, &quot;外星&quot;, &quot;圣诞&quot;]</code></pre>
<p><code>g</code>同上，是<code>[&quot;爱心&quot;, &quot;女孩&quot;, &quot;惊恐&quot;, &quot;大笑&quot;]</code>转换为代码</p>
<p>所以</p>
<pre><code class="javascript">e = &quot;010001&quot;
f = &quot;00e0b509f6259df8642dbc35662901477df22677ec152b5ff68ace615bb7b725152b3ab17a876aea8a5aa76d2e417629ec4ee341f56135fccf695280104e0312ecbda92557c93870114af6c9d05c4f7f0c3685b7a46bee255932575cce10b424d813cfe4875d3e82047b97ddef52741d546b8e289dc6935b3ece0462db0a22b8e7&quot;
g = &quot;0CoJUm6Qyw8W8jud&quot;</code></pre>
<p>嗯，常量搞清楚了，再看看加密方法</p>
<pre><code class="javascript">!function () &#123;
    function a(a) &#123;
        var d, e, b = &quot;abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789&quot;, c = &quot;&quot;;
        for (d = 0; a &gt; d; d += 1)
            e = Math.random() * b.length,
                e = Math.floor(e),
                c += b.charAt(e);
        return c
    &#125;
    function b(a, b) &#123;
        var c = CryptoJS.enc.Utf8.parse(b)
            , d = CryptoJS.enc.Utf8.parse(&quot;0102030405060708&quot;)
            , e = CryptoJS.enc.Utf8.parse(a)
            , f = CryptoJS.AES.encrypt(e, c, &#123;
                iv: d,
                mode: CryptoJS.mode.CBC
            &#125;);
        return f.toString()
    &#125;
    function c(a, b, c) &#123;
        var d, e;
        return setMaxDigits(131),
            d = new RSAKeyPair(b, &quot;&quot;, c),
            e = encryptedString(d, a)
    &#125;
    function d(d, e, f, g) &#123;
        var h = &#123;&#125;
            , i = a(16);
        return h.encText = b(d, g),
            h.encText = b(h.encText, i),
            h.encSecKey = c(i, e, f),
            h
    &#125;
    function e(a, b, d, e) &#123;
        var f = &#123;&#125;;
        return f.encText = c(a + e, b, d),
            f
    &#125;
    window.asrsea = d,
        window.ecnonasr = e
&#125;();</code></pre>
<p><code>enText</code>就是post请求里的<code>params</code>参数，来自b函数加密两次</p>
<p><code>encSecKey</code>来自c函数加密一次</p>
<h3 id="a函数"><a href="#a函数" class="headerlink" title="a函数"></a>a函数</h3><pre><code class="javascript">function a(a) &#123;
    var d, e, b = &quot;abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789&quot;, c = &quot;&quot;;
    for (d = 0; a &gt; d; d += 1)
        e = Math.random() * b.length,
            e = Math.floor(e),
            c += b.charAt(e);
    return c
&#125;</code></pre>
<p>显然，用来生成指定长度的随机字符串</p>
<h3 id="b函数"><a href="#b函数" class="headerlink" title="b函数"></a>b函数</h3><pre><code class="javascript">function b(a, b) &#123;
    var c = CryptoJS.enc.Utf8.parse(b)
        , d = CryptoJS.enc.Utf8.parse(&quot;0102030405060708&quot;)
        , e = CryptoJS.enc.Utf8.parse(a)
        , f = CryptoJS.AES.encrypt(e, c, &#123;
            iv: d,
            mode: CryptoJS.mode.CBC
        &#125;);
    return f.toString()
&#125;</code></pre>
<p>只使用了CryptoJS的函数，由于我们也用JavaScript写代码，直接复制即可，管他干嘛的-_-，只要在开头加个</p>
<pre><code class="javascript">const CryptoJS = require(&quot;crypto-js&quot;)</code></pre>
<p>即可。</p>
<h3 id="c函数"><a href="#c函数" class="headerlink" title="c函数"></a>c函数</h3><pre><code class="javascript">function c(a, b, c) &#123;
    var d, e;
    return setMaxDigits(131),
        d = new RSAKeyPair(b, &quot;&quot;, c),
        e = encryptedString(d, a)
&#125;</code></pre>
<p>看着很短，实际上调用了自定义的类，这样就不能用对付b函数的方法了，这里我们先不去看c函数干了什么</p>
<p>我们看看它的参数</p>
<table>
<thead>
<tr>
<th>c函数的参数</th>
<th>d函数里对应的变量</th>
<th>值</th>
</tr>
</thead>
<tbody><tr>
<td>a</td>
<td>i</td>
<td>长度位16的随机字符串</td>
</tr>
<tr>
<td>b</td>
<td>e</td>
<td>“010001”</td>
</tr>
<tr>
<td>c</td>
<td>f</td>
<td>“00e0b509f6259df8642dbc35662901477df22677ec152b5ff68ace615bb7b725152b3ab17a876aea8a5aa76d2e417629ec4ee341f56135fccf695280104e0312ecbda92557c93870114af6c9d05c4f7f0c3685b7a46bee255932575cce10b424d813cfe4875d3e82047b97ddef52741d546b8e289dc6935b3ece0462db0a22b8e7”</td>
</tr>
</tbody></table>
<p>站在网易的角度想想，向网易传了一串加密后的字符串，这个字符串经过一个随机数和三个常量的加密，要想解密，必然需要那个随机数，而<code>encSecKey</code>显然是用来提供那个随机数的，<code>encSecKey</code>只来自c函数且c函数接受一个随机数和两个常量，可以解密出那个随机数，因此：</p>
<p><strong>如果那个a函数得到的随机数如果我们用定值代替，嘿嘿嘿，c函数得出的</strong><code>encSecKey</code><strong>也将是定值！</strong></p>
<p>我们同调试函数即可获取一个随机数和与之对应的加密后的<code>encSecKey</code></p>
<p>我获得的是：</p>
<pre><code class="javascript">i = &quot;bEjJE2aqLOyTEZiv&quot;
encSecKey = &quot;3e7ad1dbe03a65fc32268930314b88bcbfc1e9782c3b398c30b62776e39b66a048a7122d282a13d99f9b63bd4e1940b136169fbedf56c1887933fa59a01f95c4c0e78a6d9bb7f91605408e9c1c3c2e57873c53cdf09a3d79a43cfe26260741097089e4bd19808aab395190274e687b807ffddee89f39d75f2288e28a582f3d08&quot;</code></pre>
<h3 id="写代码"><a href="#写代码" class="headerlink" title="写代码"></a>写代码</h3><p>经过上面的分析，我们可以得出如下代码：</p>
<pre><code class="javascript">const CryptoJS = require(&quot;crypto-js&quot;)

function b(a, b) &#123;
    const c = CryptoJS.enc.Utf8.parse(b)
        , d = CryptoJS.enc.Utf8.parse(&quot;0102030405060708&quot;)
        , e = CryptoJS.enc.Utf8.parse(a)
        , f = CryptoJS.AES.encrypt(e, c, &#123;
        iv: d,
        mode: CryptoJS.mode.CBC
    &#125;);
    return f.toString()
&#125;
function maker(d) &#123;
    var h = &#123;&#125;
      , i = &quot;bEjJE2aqLOyTEZiv&quot;;
    h.encText = b(d, &quot;0CoJUm6Qyw8W8jud&quot;);
    h.encText = b(h.encText, i);
    h.encSecKey = &quot;3e7ad1dbe03a65fc32268930314b88bcbfc1e9782c3b398c30b62776e39b66a048a7122d282a13d99f9b63bd4e1940b136169fbedf56c1887933fa59a01f95c4c0e78a6d9bb7f91605408e9c1c3c2e57873c53cdf09a3d79a43cfe26260741097089e4bd19808aab395190274e687b807ffddee89f39d75f2288e28a582f3d08&quot;;
    return [h.encText, h.encSecKey];
&#125;</code></pre>
<p>是不是很简单？</p>
<h2 id="3-实现后端"><a href="#3-实现后端" class="headerlink" title="3. 实现后端"></a>3. 实现后端</h2><p>这部分没什么可讲的，要讲的话也只是将web，因此，跳过。。</p>
<p>完整代码如下：</p>
<p>app.js</p>
<pre><code class="javascript">const Koa = require(&quot;koa&quot;)
const querystring = require(&quot;querystring&quot;)
const axios = require(&#39;axios&#39;)
const fs = require(&quot;fs&quot;);
const route = require(&#39;koa-route&#39;);
const app = new Koa();
const CryptoJS = require(&quot;crypto-js&quot;)

function b(a, b) &#123;
    const c = CryptoJS.enc.Utf8.parse(b)
        , d = CryptoJS.enc.Utf8.parse(&quot;0102030405060708&quot;)
        , e = CryptoJS.enc.Utf8.parse(a)
        , f = CryptoJS.AES.encrypt(e, c, &#123;
        iv: d,
        mode: CryptoJS.mode.CBC
    &#125;);
    return f.toString()
&#125;
function maker(d) &#123;
    var h = &#123;&#125;
      , i = &quot;bEjJE2aqLOyTEZiv&quot;;
    h.encText = b(d, &quot;0CoJUm6Qyw8W8jud&quot;);
    h.encText = b(h.encText, i);
    h.encSecKey = &quot;3e7ad1dbe03a65fc32268930314b88bcbfc1e9782c3b398c30b62776e39b66a048a7122d282a13d99f9b63bd4e1940b136169fbedf56c1887933fa59a01f95c4c0e78a6d9bb7f91605408e9c1c3c2e57873c53cdf09a3d79a43cfe26260741097089e4bd19808aab395190274e687b807ffddee89f39d75f2288e28a582f3d08&quot;;
    return [h.encText, h.encSecKey];
&#125;

const page = (ctx) =&gt; &#123;
    ctx.response.type = &quot;html&quot;;
    ctx.response.body = fs.createReadStream(&quot;./index.html&quot;);
&#125;
const request = async (id) =&gt; &#123;
    const answer = &#123;status: 500, body: &#123;&#125;&#125;
    let params = maker(JSON.stringify(&#123;
        ids: [id],
        level: &quot;standard&quot;,
        encodeType: &quot;aac&quot;,
        csrf_token: &quot;&quot;
    &#125;));
    const settings = &#123;
        method: &quot;post&quot;,
        url: &quot;https://music.163.com/weapi/song/enhance/player/url/v1?csrf_token=&quot;,
        data: querystring.stringify(&#123;
            params: params[0],
            encSecKey: params[1]
        &#125;)
    &#125;;
    await axios(settings)
        .then(res =&gt; &#123;
            answer.body = res.data;
            answer.status = true;
        &#125;)
        .catch((err =&gt; &#123;
            answer.body = err;
            answer.status = false;
        &#125;));
    return answer;
&#125;
const analyze = async (ctx) =&gt; &#123;
    let result = &quot;&lt;p&gt;服务器出错！请联系管理员&lt;/p&gt;&quot;;
    await request(ctx.request.query.id)
        .then((res) =&gt; &#123;
            let data;
            if (res.status) &#123;
                data = res.body;
                if (data.code === 200) &#123;
                    result = &#39;&lt;p&gt;歌曲id为:&#39; + data.data[0].id + &#39;&lt;/p&gt;&lt;p&gt;点击&lt;a href=&quot;&#39; + data.data[0].url + &#39;&quot;&gt;链接&lt;/a&gt;下载&lt;/p&gt;&#39;;
                &#125; else &#123;
                    result = &#39;&lt;p&gt;输入错误！&lt;/p&gt;&#39;;
                &#125;
            &#125;
        &#125;)
        .catch((err) =&gt; &#123;
            result = &#39;&lt;p&gt;输入错误！&lt;/p&gt;&lt;br /&gt;&#39; + JSON.stringify(err);
        &#125;)
    ctx.response.body = result;
    ctx.response.type = &quot;html&quot;;
&#125;
app.use(route.get(&quot;/&quot;, page))
app.use(route.get(&quot;/url&quot;, analyze))

app.listen(3000);</code></pre>
<h2 id="4-实现前端"><a href="#4-实现前端" class="headerlink" title="4. 实现前端"></a>4. 实现前端</h2><p>额，前端我真的不太会，随便写一个吧，能用就行</p>
<p>index.html</p>
<pre><code class="html">&lt;!DOCTYPE html&gt;
&lt;html lang=&quot;zh-CN&quot;&gt;
&lt;head&gt;
    &lt;meta charset=&quot;UTF-8&quot;&gt;
    &lt;title&gt;网易云音乐链接分析器&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
    输入歌曲id:&lt;br&gt;
    &lt;label for=&quot;id&quot;&gt;&lt;/label&gt;&lt;input id=&quot;id&quot; type=&quot;text&quot; name=&quot;id&quot; value=&quot;&quot;&gt;
    &lt;br&gt;
    &lt;button onclick=&quot;getWyyyy()&quot;&gt;获取下载链接&lt;/button&gt;
&lt;/body&gt;
&lt;script&gt;
    function getWyyyy() &#123;
        let input = document.getElementById(&quot;id&quot;).value
        window.location.href = &quot;http://localhost:3000/url?id=&quot; + input
    &#125;
&lt;/script&gt;
&lt;/html&gt;</code></pre>
<p>记得完成后把<code>localhost</code>换成自己的IP或域名哦(如果像远程使用的话)</p>
<h1 id="测试"><a href="#测试" class="headerlink" title="测试"></a>测试</h1><p>运行命令:</p>
<pre><code class="shell">node app.js</code></pre>
<p>打开浏览器，输入网址：</p>
<pre><code>http://localhost:3000/</code></pre>
<p>如果一切正常，你将看到你写的前端界面</p>
<p><img src="%E6%B5%8B%E8%AF%9501.png" alt="测试01"></p>
<p>输入歌曲id，点击按钮</p>
<p><img src="%E6%B5%8B%E8%AF%9502.png" alt="测试02"></p>
<p><img src="%E6%B5%8B%E8%AF%9503.png" alt="测试03"></p>
<p>弹出下载界面，成功！</p>

                
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